Pfizer tags Viagra to combat counterfeiting

In a move to combat counterfeiting, Pfizer has begun shipping Viagra (sildenafil citrate) with radio frequency identification (RFID) tags attached to each package, case, and pallet in the U.S. Using special electronic scanners, wholesalers and pharmacists can read the RFID tags to verify whether a product is Viagra. The RFID system does not, however, track and trace Viagra as it moves through the supply chain.